Abstract
Abstract The expected factor four increase in peak luminosity of the high-luminosity LHC (HL-LHC) compared to the current LHC system will force the ATLAS experiment to increase early stage trigger selection power. The agreed strategy is to implement precise hardware track reconstruction, through which sharper trigger turn-on curves can be achieved for primary single-lepton selections, while contributing to b-tagging and tau-tagging techniques as well as pileup mitigation for hadronic signatures, such as multijet and missing transverse momentum. This work discusses the requirements, architecture and projected performance of the system in terms of tracking capability, and trigger selection, based on detailed simulations.
Highlights
The expected factor four increase in peak luminosity of the high-luminosity LHC (HL-LHC) compared to the current LHC system will force the ATLAS experiment to increase early stage trigger selection power
The HTT system is organised as independent logical tracking units called HTT units (Fig. 2).[1]
Depending on the trigger signature two types of track reconstruction requests can be sent from the EF to the HTT system: regional or global, corresponding to the first stage only or to the first plus second stage of processing
Summary
The HTT system is organised as independent logical tracking units called HTT units (Fig. 2).[1]. Depending on the trigger signature two types of track reconstruction requests can be sent from the EF to the HTT system: regional (rHTT) or global (gHTT), corresponding to the first stage only or to the first plus second stage of processing. The gHTT searches for all tracks with pT > 1 GeV at a rate of 100 kHz. The gHTT searches for all tracks with pT > 1 GeV at a rate of 100 kHz Both rHTT and gHTT cover the full ITk acceptance (|η| < 4)
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